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trace()

Usage:
trace(x), x a REAL square matrix



Keywords: matrix algebra
trace(x) computes the so-called trace of REAL square matrix x, that is,
sum(diag(x)) = x[1,1]+x[2,2]+...+x[k,k], when x is k by k..

See also topics 'matrices', dmat(), diag(), det().


Gary Oehlert 2003-01-15